- Email: [email protected]
02150 Dynamic analysis of substation busbar structures
06
Electrical power supply and utilization (scientific, technical)
Economics, Policy, Supplies, Forecasts
98102143 system
Nuclear power in the global energy-envlronmental
Yamaji, K. Prog. Nucl. Energy, 1998 (Pub. 1997), 32, (3/4), 235-241. Among the various technological options for COz emissions reduction from energy production, nuclear power is expected to play a key role if accepted by society. Fewer model analyses, however, have been reported recently on the role of nuclear power in the global energy system as compared with analyses of other options such as energy efficiency improvements, renewable energy sources, and COz recovery and disposal. With a newly developed global energy model, this paper presents a numerical analysis of the value of the nuclear option in the global energy system, particularly in terms of COz mitigation. The global energy model analyses the value of nuclear power. The model incorporates detailed descriptions of energy conversion technologies which include, besides electricity generation, various liquefaction and gasification processes of hydrocarbon fuels with the options of COz recovery and disposal. Major findings are: (1) light water reactors (LWRs) would be introduced at the maximum level into the minimum cast energy system if their economics is slightly improved from the standard assumption; however, (2) the effect of the maximum introduction of LWRs in reducing the global COz emissions would be small; (3) fast breeder reactors (FBRs) would be introduced at an almost maximum scale when the stabilization of global CO2 emission is required; (4) the role of FBRs in reducing global COz emission is very robust against the deterioration of their economics; and (5) when FBRs are not introduced, they would be replaced by integrated coal gasification combined cycle power generation (IGCC) with COz recovery.
The strategies of abating emission of CO* and 98102144 nuclear energy development in China Fang, D. and Li, H. Prog. Nucl. Energy, 1998 (Pub. 1997) 32, (314). 307313. In order to meet the high-speed development of the economy and improvement of the people’s living quality in China, annual coal consumption was the greatest in the world. COz emissions from coal firing is a main contributor to climate change. It is essential to abate carbon dioxide emissions and also develop the economy in relation to mitigation of the global climate change. The development of nuclear energy is a feasible option in relation to this problem.
06
for the
Dash, P. K. et al. Electric Power Systems Research, 1997, 41, (3), 203-210. The paper presents a new approach to the estimation of power system frequency using an adaptive neural network. This approach uses a linear adaptive neuron or an adaptive linear combiner called ‘Adaline’ to identify the parameters of a discrete signal model of the power system voltage. Adjustment of the learning parameters force the error between the actual and the computed signal samples to satisfy a stable difference error equation, rather than to minimize an error function. Highly robust, the proposed algorithm can estimate accurately over a wide range of frequency changes. The technique is shown to be capable of tracking power system conditions and is immune to the effects of harmonics and random noise.
lmpor-
Thorp, J. S. et al. Electrical Power & Energy Systems, 1998, 20, (2), 147152. Studies show protection systems frequently play a role in the sequence of events that lead to power system disturbances. While the self-monitoring and self-checking feature of digital relays is generally expected to reduce the probability of such relay involvement, there has been no qualitative evaluation of the effect of such a reduction. The technique of ‘importance sampling’ is used to make this problem more manageable. Using the New England 39-bus system, it is shown that reducing probability of relay involvement has a significant influence on overall system reliability.
194
Fuel and Energy Abstracts
May 1998
98102148 Application of grey linear programming to shortterm hydro scheduling Liang. R.-H. Electric Power Systems Research, 1997, 41, (3), 159-165. Problems with short-term hydro scheduling are addressed with an approach which uses linear programming based on the grey constrained interval. This approach is characterized by the fact that the errors in the forecast hourly loads and natural inflows can be taken into account by using grey number notation. The approach is therefore superior to the conventional linear programming method in which the hourly loads and natural inflows are assumed to be exactly known and there are no errors in the forecast loads and natural inflows. Optimal scheduling under an uncertain environment can be achieved by a grey linear programming model in which the hourly loads, the hourly natural inflows are all expressed in grey number notation, is developed. Such an approach has been applied in a Taiwan power system and proved very effective in obtaining proper hydrogeneration schedules in uncertain conditions. 98102149
Aspects of design optimization for multiple tooth per stator pole switched reluctance motors W&. and Finch, J. W. Electric Power Systems Research, 1997, 42, (l),
The design of switched reluctance motors was conducted using two developed computer packages. Limits are placed on the design possibilities by focusing on two prototype multiple tooth per stator pole devices. These packages correctly allow for all the major practical effects, including magnetic saturation and core losses. A typical series of runs of these packages were performed, leading to general design recommendations that are of particular use for initial design of switched reluctance motors.
Dynamic analysis of substation busbar structures 98/02150 Budinich, M. D. and Trahan, R. E. Electric Power Systems Research, 1997, 42, (1). 47-53. Substation busbar structures are usually designed by analysing the short circuit force loading with an equivalent static loading. This paper shows, however, that the relatively slow response modes of the structure require a dynamic analysis to be performed for the higher frequency short circuit forces. Full scale test data is compared to simulation results obtained from a finite element model. An efficient method for pumped-storage planning and evaluation
Scientific, Technical
98102148 Anatomy of power system disturbances: tance sampling
Anodes for secondary lithium batteries
Kojima, Y. et al. Jpn. Kokai Tokkyo Koho JP 09,320,602 [97,320,602] (Cl. HOlM4/58), 12 Dee 1997, JP Appl. 961103,605, 28 Mar 1996, 6 .pp. . (In Japanese) The Li intercalating anodes are composed of 500-850 treated petroleum or coal coke. The heat-treated coke preferably has a hydrogen/carbon atmospheric ratio 20.06, an oxygen/carbon atmospheric ratio 10.03 and a conductivity of >lO-’ S/cm.
gal021 51
ELECTRICAL POWER SUPPLY AND UTILIZATION
An adaptive neural network approach 98102145 estimation of power system frequency
98102147
Yen, M. and Zhang, S. Electric Power Systems Research, 1997, 42, (1) 6370. The paper develops an efficient method for systematic planning and evaluation of pumped-storage plants. A detailed operation simulation using an hourly chronological probabilistic production costing model is introduced, to reflect the time dependency of storage operation policies through the charging and discharging processes. The optimum capacity of pumpedstorage plants is chosen to minimize the overall system cost. In addition, peaking constraints are incorporated both in the thermal unit planning model and in the daily operation simulation model, so it is well-suited to the planning and evaluation of peaking plants. The paper gives a detailed description of the algorithm and its realization in the East China Electric Power System is discussed. gal021 52
An enhanced Hopfleld model for economic dlspatch considering prohibited zones
$:$;T.
and Chiou, G.-J.
Electric Power Systems Research, 1997, 42, (1)
This enhanced Hopfield model offers a novel technique to resolve economic dispatch (ED) problems with prohibited operating zones. The ED problem becomes a non-convex optimization problem with prohibited operating zones and consequently there are many local minima embedded in the problem. The proposed Hopfield model enables one can reach the global minimum for this non-convex problem. An energy function is defined in the model proposed. The model solution moves in the direction of decreasing energy and finally searches out an optimal point with minimum energy. Applying the proposed approach is demonstrated by a 15-unit system with 4 units having prohibited zones. From the sample system study results, the proposed method shows the advantage of having far less computational requirements than that of the conventional method. The proposed method is therefore more suitable for real time application. A flexible ac transmission balancing arc furnace loads
9Bio2153
system (FACTS) for
El-Sadek, M. Z. er al. Elecrric Power Systems Research, 1997, 41, (3) 211218. A new technique for balancing unbalanced three phase arc furnace loads is proposed-the flexible a.c. transmission system (FACTS). Although it is possible to balance conductor reactivities via conventional methods, the
Electrical power supply and utilization (scientific, technical)
Economics, Policy, Supplies, Forecasts
98102143 system
Nuclear power in the global energy-envlronmental
Yamaji, K. Prog. Nucl. Energy, 1998 (Pub. 1997), 32, (3/4), 235-241. Among the various technological options for COz emissions reduction from energy production, nuclear power is expected to play a key role if accepted by society. Fewer model analyses, however, have been reported recently on the role of nuclear power in the global energy system as compared with analyses of other options such as energy efficiency improvements, renewable energy sources, and COz recovery and disposal. With a newly developed global energy model, this paper presents a numerical analysis of the value of the nuclear option in the global energy system, particularly in terms of COz mitigation. The global energy model analyses the value of nuclear power. The model incorporates detailed descriptions of energy conversion technologies which include, besides electricity generation, various liquefaction and gasification processes of hydrocarbon fuels with the options of COz recovery and disposal. Major findings are: (1) light water reactors (LWRs) would be introduced at the maximum level into the minimum cast energy system if their economics is slightly improved from the standard assumption; however, (2) the effect of the maximum introduction of LWRs in reducing the global COz emissions would be small; (3) fast breeder reactors (FBRs) would be introduced at an almost maximum scale when the stabilization of global CO2 emission is required; (4) the role of FBRs in reducing global COz emission is very robust against the deterioration of their economics; and (5) when FBRs are not introduced, they would be replaced by integrated coal gasification combined cycle power generation (IGCC) with COz recovery.
The strategies of abating emission of CO* and 98102144 nuclear energy development in China Fang, D. and Li, H. Prog. Nucl. Energy, 1998 (Pub. 1997) 32, (314). 307313. In order to meet the high-speed development of the economy and improvement of the people’s living quality in China, annual coal consumption was the greatest in the world. COz emissions from coal firing is a main contributor to climate change. It is essential to abate carbon dioxide emissions and also develop the economy in relation to mitigation of the global climate change. The development of nuclear energy is a feasible option in relation to this problem.
06
for the
Dash, P. K. et al. Electric Power Systems Research, 1997, 41, (3), 203-210. The paper presents a new approach to the estimation of power system frequency using an adaptive neural network. This approach uses a linear adaptive neuron or an adaptive linear combiner called ‘Adaline’ to identify the parameters of a discrete signal model of the power system voltage. Adjustment of the learning parameters force the error between the actual and the computed signal samples to satisfy a stable difference error equation, rather than to minimize an error function. Highly robust, the proposed algorithm can estimate accurately over a wide range of frequency changes. The technique is shown to be capable of tracking power system conditions and is immune to the effects of harmonics and random noise.
lmpor-
Thorp, J. S. et al. Electrical Power & Energy Systems, 1998, 20, (2), 147152. Studies show protection systems frequently play a role in the sequence of events that lead to power system disturbances. While the self-monitoring and self-checking feature of digital relays is generally expected to reduce the probability of such relay involvement, there has been no qualitative evaluation of the effect of such a reduction. The technique of ‘importance sampling’ is used to make this problem more manageable. Using the New England 39-bus system, it is shown that reducing probability of relay involvement has a significant influence on overall system reliability.
194
Fuel and Energy Abstracts
May 1998
98102148 Application of grey linear programming to shortterm hydro scheduling Liang. R.-H. Electric Power Systems Research, 1997, 41, (3), 159-165. Problems with short-term hydro scheduling are addressed with an approach which uses linear programming based on the grey constrained interval. This approach is characterized by the fact that the errors in the forecast hourly loads and natural inflows can be taken into account by using grey number notation. The approach is therefore superior to the conventional linear programming method in which the hourly loads and natural inflows are assumed to be exactly known and there are no errors in the forecast loads and natural inflows. Optimal scheduling under an uncertain environment can be achieved by a grey linear programming model in which the hourly loads, the hourly natural inflows are all expressed in grey number notation, is developed. Such an approach has been applied in a Taiwan power system and proved very effective in obtaining proper hydrogeneration schedules in uncertain conditions. 98102149
Aspects of design optimization for multiple tooth per stator pole switched reluctance motors W&. and Finch, J. W. Electric Power Systems Research, 1997, 42, (l),
The design of switched reluctance motors was conducted using two developed computer packages. Limits are placed on the design possibilities by focusing on two prototype multiple tooth per stator pole devices. These packages correctly allow for all the major practical effects, including magnetic saturation and core losses. A typical series of runs of these packages were performed, leading to general design recommendations that are of particular use for initial design of switched reluctance motors.
Dynamic analysis of substation busbar structures 98/02150 Budinich, M. D. and Trahan, R. E. Electric Power Systems Research, 1997, 42, (1). 47-53. Substation busbar structures are usually designed by analysing the short circuit force loading with an equivalent static loading. This paper shows, however, that the relatively slow response modes of the structure require a dynamic analysis to be performed for the higher frequency short circuit forces. Full scale test data is compared to simulation results obtained from a finite element model. An efficient method for pumped-storage planning and evaluation
Scientific, Technical
98102148 Anatomy of power system disturbances: tance sampling
Anodes for secondary lithium batteries
Kojima, Y. et al. Jpn. Kokai Tokkyo Koho JP 09,320,602 [97,320,602] (Cl. HOlM4/58), 12 Dee 1997, JP Appl. 961103,605, 28 Mar 1996, 6 .pp. . (In Japanese) The Li intercalating anodes are composed of 500-850 treated petroleum or coal coke. The heat-treated coke preferably has a hydrogen/carbon atmospheric ratio 20.06, an oxygen/carbon atmospheric ratio 10.03 and a conductivity of >lO-’ S/cm.
gal021 51
ELECTRICAL POWER SUPPLY AND UTILIZATION
An adaptive neural network approach 98102145 estimation of power system frequency
98102147
Yen, M. and Zhang, S. Electric Power Systems Research, 1997, 42, (1) 6370. The paper develops an efficient method for systematic planning and evaluation of pumped-storage plants. A detailed operation simulation using an hourly chronological probabilistic production costing model is introduced, to reflect the time dependency of storage operation policies through the charging and discharging processes. The optimum capacity of pumpedstorage plants is chosen to minimize the overall system cost. In addition, peaking constraints are incorporated both in the thermal unit planning model and in the daily operation simulation model, so it is well-suited to the planning and evaluation of peaking plants. The paper gives a detailed description of the algorithm and its realization in the East China Electric Power System is discussed. gal021 52
An enhanced Hopfleld model for economic dlspatch considering prohibited zones
$:$;T.
and Chiou, G.-J.
Electric Power Systems Research, 1997, 42, (1)
This enhanced Hopfield model offers a novel technique to resolve economic dispatch (ED) problems with prohibited operating zones. The ED problem becomes a non-convex optimization problem with prohibited operating zones and consequently there are many local minima embedded in the problem. The proposed Hopfield model enables one can reach the global minimum for this non-convex problem. An energy function is defined in the model proposed. The model solution moves in the direction of decreasing energy and finally searches out an optimal point with minimum energy. Applying the proposed approach is demonstrated by a 15-unit system with 4 units having prohibited zones. From the sample system study results, the proposed method shows the advantage of having far less computational requirements than that of the conventional method. The proposed method is therefore more suitable for real time application. A flexible ac transmission balancing arc furnace loads
9Bio2153
system (FACTS) for
El-Sadek, M. Z. er al. Elecrric Power Systems Research, 1997, 41, (3) 211218. A new technique for balancing unbalanced three phase arc furnace loads is proposed-the flexible a.c. transmission system (FACTS). Although it is possible to balance conductor reactivities via conventional methods, the